Input end locking mechanism of gearbox

Abstract

The utility model provides an input end locking mechanism of a gear box, the gear box comprises a hand wheel and an input shaft connected with the hand wheel, the input shaft drives an output shaft to move by driving a linkage assembly in the gear box, a locking mechanism is arranged on the input shaft in a matched mode, the locking mechanism comprises an eccentric wheel linked with a locking handle, and the eccentric wheel is connected with the input shaft. The positioning structure is arranged around the eccentric wheel; the circle center of the eccentric wheel and the rotating axis of the locking handle are eccentrically arranged, and the locking handle rotates along the rotating axis of the locking handle and drives the eccentric wheel to rotate so as to change the position relation between the circle center of the eccentric wheel and the positioning structure, so that the locking handle drives the eccentric wheel to rotate to the positioning structure to be mutually positioned with the eccentric wheel. The locking position is used for driving the eccentric wheel to rotate until the eccentric wheel is separated from the positioning structure or positioning is released, and then the unlocking position is used for releasing limiting of the input shaft, installation is convenient, operation is easy, and practicability is high.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical transmission boxes, in particular to an input end locking mechanism of a gear box. Background Art

[0002] The mechanical transmission box mainly includes a box body and a gear structure or a worm gear mechanism arranged in the box body. Among them, the manual gear box operates the input shaft through an external handwheel, so that the input shaft drives the gear and other transmission devices to move, thereby driving the output shaft to rotate.

[0003] However, after the transmission device in the box drives the output shaft to move to the specified position, it needs to be positioned. Especially when the gear box is used in the valve field, the output shaft needs to be accurately positioned to avoid accidental touch or changes in valve switching or flow stability caused by the fluid. Therefore, a locking mechanism for positioning and locking the transmission device and the input and output shafts came into being.

[0004] The applicant has been conducting research and development and improvement on mechanical transmission boxes for a long time. This time, a locking mechanism for the input shaft of a manual gearbox is designed to make the gearbox have better practical performance. Summary of the invention

[0005] The purpose of the utility model is to overcome the shortcomings and deficiencies of the prior art and to provide a locking mechanism for the input end of a gear box, which is particularly suitable for locking a valve gear box to prevent valve switching or flow stability changes caused by fluid.

[0006] The technical solution adopted by the utility model is as follows: a locking mechanism for the input end of a gearbox, the gearbox comprising a handwheel and an input shaft connected to the handwheel, the input shaft drives the output shaft to move by driving a linkage component in the gearbox, a locking mechanism is arranged on the input shaft, the locking mechanism comprises an eccentric wheel linked to a locking handle, and a positioning structure arranged around the eccentric wheel; the center of the eccentric wheel is eccentrically arranged with respect to the rotation axis of the locking handle, and the locking handle rotates along its rotation axis and drives the eccentric wheel to rotate, so as to change the positional relationship between the center of the eccentric wheel and the positioning structure, so that the locking handle has a locking position for driving the eccentric wheel to rotate until the positioning structure and the eccentric wheel are mutually positioned, thereby limiting the input shaft, and an unlocking position for driving the eccentric wheel to rotate until the eccentric wheel and the positioning structure are separated or released from the positioning, thereby releasing the limit on the input shaft.

[0007] One implementation scheme is as follows: the eccentric wheel is an eccentric sleeve connected to the locking handle and sleeved on the outer periphery of the input shaft, and the positioning structure includes a limiting fixing pin arranged around the eccentric sleeve. When the handle is moved, the eccentric sleeve rotates synchronously with the input shaft, so that the size of the gap between the eccentric sleeve and the limiting fixing pin changes, thereby realizing the switching between the locking position and the unlocking position.

[0008] The limit fixing pin includes a first limit fixing pin and a second limit fixing pin respectively arranged on both sides of the eccentric sleeve, and the locking handle rotates with the eccentric sleeve and swings between the first limit fixing pin and the second limit fixing pin; that is, the two limit fixing pins limit the travel of the eccentric sleeve in the clockwise and counterclockwise directions of rotation respectively; when the locking handle is moved clockwise, the eccentric sleeve gradually approaches the right limit fixing pin during the clockwise rotation process, and the gap between the two becomes smaller and smaller until it is locked; when the locking handle is moved counterclockwise, the eccentric sleeve gradually approaches the right limit fixing pin during the counterclockwise rotation process, and the gap between the two becomes smaller and smaller until it is locked.

[0009] Preferably, it also includes a third limit fixing pin located on the side of the eccentric sleeve away from the locking handle. When the locking handle is in the middle position, the eccentric sleeve and the three limit fixing pins maintain a reasonable gap, and the handwheel can be rotated in any direction to drive the input shaft to rotate.

[0010] Another implementation scheme is: the eccentric wheel is connected to the locking handle, and the positioning structure includes a hinge clamp with an opening, a locking screw arranged at the opening of the hinge clamp, and an adjusting nut connected to the end of the locking screw; the hinge clamp is enclosed around the outer periphery of the input shaft, and the locking handle drives the eccentric wheel to rotate synchronously, so that the locking handle has a locking position that drives the eccentric wheel to rotate and pushes one side of the hinge clamp until the opening of the hinge clamp becomes smaller and the input shaft is clamped, and an unlocking position that drives the eccentric wheel to rotate to enlarge the opening of the hinge clamp, thereby releasing the limit on the input shaft.

[0011] The positioning structure also includes a positioning shaft, the hinge clamp is in the shape of an "8" and two arc structures thereof are respectively installed on the input shaft and the positioning shaft; the specific configuration is: the hinge clamp has two independent semicircles, which are symmetrically installed on the positioning shaft, and the closing size can be changed; the locking screw is installed at the opening of the hinge clamp to adjust the size of the hinge opening.

[0012] When in use, move the locking handle counterclockwise, the eccentricity of the eccentric wheel will decrease, the gap size from the nut of the locking screw to the locking screw shaft will increase, the hinge will loosen, the input shaft will be released, and the handwheel can be rotated; move the locking handle clockwise, the eccentricity of the eccentric wheel will increase, the gap size from the nut of the locking screw to the locking screw shaft will decrease, the hinge will close, the input shaft will be locked, and the handwheel cannot be rotated.

[0013] The nut on the locking screw can adjust the locking force; the hinge clamp and the input shaft are coaxially fully surrounded, and the input shaft will not be subjected to radial force when clamped. The contact surface is larger, the locking force is better, and it is not affected by the positive or reverse force of the fluid.

[0014] Preferably, in the above solution, the locking handle and the eccentric wheel are an integrated structure.

[0015] The beneficial effects of the utility model are as follows: the technical solution sets a locking mechanism on the input shaft, and the eccentric wheel center is eccentrically arranged with the rotating axis of the locking handle, and the eccentric wheel and the positioning structure arranged around the eccentric wheel cooperate with each other, so that the locking handle has a locking position that drives the eccentric wheel to rotate until the positioning structure and the eccentric wheel are mutually positioned, thereby limiting the input shaft, and has an unlocking position that drives the eccentric wheel to rotate until the eccentric wheel and the positioning structure are separated or released, thereby releasing the limit of the input shaft. The locking mechanism of the device realizes locking and unlocking of the input shaft through the mutual cooperation of the locking handle, the eccentric wheel, and the positioning structure, and is easy to install, simple to operate, and highly practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, without paying creative labor, other drawings obtained based on these drawings still belong to the scope of the utility model.

[0017] Figure 1 It is a side cross-sectional view of the structure of Example 1;

[0018] Figure 2 This is a structural schematic diagram of Example 1;

[0019] Figure 3 It is a side cross-sectional view of the structure of Example 2;

[0020] Figure 4 This is a structural schematic diagram of Example 3;

[0021] In the figure, 1-handwheel, 2-input shaft, 3-locking handle, 31-eccentric sleeve, 301-eccentric wheel, 302-locking screw, 303-adjusting nut, 304-hinge clip, 305-positioning shaft, 32-limiting fixing pin, 4-output shaft. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of the utility model clearer, the utility model will be further described in detail below with reference to the accompanying drawings.

[0023] It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are for distinguishing two non-identical entities with the same name or non-identical parameters. It can be seen that "first" and "second" are only for the convenience of expression and should not be understood as limitations on the embodiments of the present invention. The subsequent embodiments will not explain this one by one.

[0024] The directions and positions mentioned in the present invention, such as "upper", "lower", "front", "back", "left", "right", "inside", "outside", "top", "bottom", "side", etc., are only for reference to the directions or positions of the drawings. Therefore, the directions and positions used are used to explain and understand the present invention, but not to limit the scope of protection of the present invention.

[0025] Example 1

[0026] like Figure 1-2 As shown, a locking mechanism for the input end of a gearbox, the gearbox comprises a handwheel 1, an input shaft 2 connected to the handwheel 1, the input shaft 2 drives the output shaft 4 to move by driving a linkage assembly in the gearbox, the input shaft 2 is provided with a locking mechanism, the locking mechanism comprises an eccentric wheel linked to a locking handle 3, and a positioning structure arranged around the eccentric wheel;

[0027] The center of the eccentric wheel is eccentrically arranged with respect to the rotation axis of the locking handle 3. In the present embodiment, the center of the rotation axis is the center of the input shaft, and the locking handle 3 rotates along its rotation axis and drives the eccentric wheel to rotate, so as to change the positional relationship between the center of the eccentric wheel and the positioning structure, so that the locking handle 3 has the function of driving the eccentric wheel to rotate until the positioning structure and the eccentric wheel are mutually positioned, thereby limiting the input shaft 2 in the locking position, and driving the eccentric wheel to rotate until the eccentric wheel and the positioning structure are separated or released from the positioning, thereby releasing the limit on the input shaft 2 in the unlocking position.

[0028] The eccentric wheel is an eccentric sleeve 31 connected to the locking handle 3 and sleeved on the outer periphery of the input shaft 2. The positioning structure includes a limiting fixing pin 32 arranged around the eccentric sleeve 31. The eccentric sleeve 31 rotates synchronously with the input shaft 2 to achieve its switching between the locking position and the unlocking position.

[0029] The limiting fixing pin 32 includes a first limiting fixing pin and a second limiting fixing pin respectively arranged on both sides of the eccentric sleeve 31 , and the locking handle 3 rotates with the eccentric sleeve 31 and swings between the first limiting fixing pin and the second limiting fixing pin.

[0030] That is, the two limit fixing pins limit the travel of the eccentric sleeve 31 in the clockwise and counterclockwise directions respectively; when the locking handle is moved clockwise, the eccentric sleeve gradually approaches the right limit fixing pin during the clockwise rotation, and the gap between the two becomes smaller and smaller until it is locked; when the locking handle is moved counterclockwise, the eccentric sleeve gradually approaches the right limit fixing pin during the counterclockwise rotation, and the gap between the two becomes smaller and smaller until it is locked; clockwise or counterclockwise locking is performed by technical personnel in this field according to the needs of the locking direction.

[0031] It also includes a third limit fixing pin located on the side of the eccentric sleeve 31 away from the locking handle 3. When the locking handle is in the middle position, the eccentric sleeve and the three limit fixing pins maintain a reasonable gap, and the handwheel can be rotated in any direction to drive the input shaft to rotate.

[0032] Example 2

[0033] like Figure 3-4 As shown, the eccentric wheel 301 is connected to the locking handle 3, and the positioning structure includes a hinge clip 304 with an opening, a locking screw 302 arranged at the opening of the hinge clip 304, and an adjusting nut 303 connected to the end of the locking screw 302; the hinge clip 304 is embraced on the outer periphery of the input shaft, and the locking handle 3 drives the eccentric wheel 301 to rotate synchronously, so that the locking handle 3 has the locking position of driving the eccentric wheel to rotate and push one side of the hinge clip 304 to reduce the opening of the hinge clip 304 and hold the input shaft 2, and the unlocking position of driving the eccentric wheel to rotate to enlarge the opening of the hinge clip 304, thereby releasing the limit of the input shaft 2.

[0034] The positioning structure further includes a positioning shaft 305 , and the hinge clip 304 is in an “8” shape, and two arc structures thereof are respectively installed on the input shaft 2 and the positioning shaft 305 .

[0035] The specific configuration is as follows: the hinge clip has two independent semicircles, which are symmetrically mounted on the positioning shaft 305, and the size of the closing can be changed. The locking screw is installed at the opening of the hinge clip to adjust the size of the hinge opening.

[0036] Move the locking handle counterclockwise, the eccentric distance of the eccentric wheel will be reduced, the gap between the nut of the locking screw and the locking screw shaft will be larger, the hinge will be loosened, the input shaft will be released, and the handwheel can be turned.

[0037] Move the locking handle clockwise, the eccentricity of the eccentric wheel increases, the gap between the nut of the locking screw and the locking screw shaft decreases, the hinge closes, the input shaft is locked, and the handwheel cannot be turned.

[0038] The nut on the locking screw can adjust the locking force; the hinge clamp and the input shaft are coaxially fully surrounded, and the input shaft will not be subjected to radial force when clamped. The contact surface is larger, the locking force is better, and it is not affected by the positive or reverse force of the fluid.

[0039] Furthermore, in the above-mentioned Embodiment 1 and Embodiment 2, the locking handle 3 and the eccentric wheel are an integrated structure.

[0040] The above disclosure is only a preferred embodiment of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope covered by the present invention.

Claims

1. A locking mechanism for an input end of a gear box, the gear box comprising a hand wheel (1), an input shaft (2) connected to the hand wheel (1), the input shaft (2) driving an output shaft (4) to move by driving a linkage assembly in the gear box, characterized in that: The input shaft (2) is provided with a locking mechanism, the locking mechanism comprising an eccentric wheel linked with the locking handle (3), and a positioning structure arranged around the eccentric wheel; The center of the eccentric wheel is eccentrically arranged with respect to the rotation axis of the locking handle (3), and the locking handle (3) rotates along its rotation axis and drives the eccentric wheel to rotate, so as to change the positional relationship between the center of the eccentric wheel and the positioning structure, so that the locking handle (3) has a locking position in which the eccentric wheel is driven to rotate until the positioning structure and the eccentric wheel are mutually positioned, thereby limiting the input shaft (2), and an unlocking position in which the eccentric wheel is driven to rotate until the eccentric wheel and the positioning structure are separated or released from the positioning, thereby releasing the limit on the input shaft (2).

2. The input end locking mechanism of a gear box according to claim 1, characterized in that: The eccentric wheel is an eccentric sleeve (31) connected to the locking handle (3) and sleeved on the outer periphery of the input shaft (2); the positioning structure comprises a limiting fixing pin (32) arranged around the eccentric sleeve (31); the eccentric sleeve (31) rotates synchronously with the input shaft (2) to achieve switching between a locking position and an unlocking position.

3. The input end locking mechanism of a gear box according to claim 2, characterized in that: The limiting fixing pin (32) comprises a first limiting fixing pin and a second limiting fixing pin respectively arranged on both sides of the eccentric sleeve (31); the locking handle (3) rotates with the eccentric sleeve (31) and swings between the first limiting fixing pin and the second limiting fixing pin.

4. The input end locking mechanism of a gear box according to claim 3, characterized in that: It also includes a third limiting fixing pin located on a side of the eccentric sleeve (31) away from the locking handle (3).

5. The input end locking mechanism of a gear box according to claim 1, characterized in that: The eccentric wheel (301) is connected to the locking handle (3), and the positioning structure comprises a hinge clip (304) having an opening, a locking screw (302) arranged at the opening of the hinge clip (304), and an adjusting nut (303) connected to the end of the locking screw (302); The hinge clamp (304) is enclosed around the outer periphery of the input shaft (2), and the locking handle (3) drives the eccentric wheel (301) to rotate synchronously, so that the locking handle (3) has a locking position in which the eccentric wheel is driven to rotate and pushes one side of the hinge clamp (304) until the opening of the hinge clamp (304) becomes smaller and the input shaft (2) is tightly enclosed, and an unlocking position in which the eccentric wheel is driven to rotate so that the opening of the hinge clamp (304) becomes larger, thereby releasing the limit on the input shaft (2).

6. The input end locking mechanism of a gear box according to claim 5, characterized in that: The positioning structure also includes a positioning rotating shaft (305), and the hinge clip (304) is in an "8" shape, with two arc structures respectively mounted on the input shaft (2) and the positioning rotating shaft (305).

7. The input end locking mechanism of a gear box according to any one of claims 1 to 6, characterized in that: The locking handle (3) and the eccentric wheel are an integrated structure.

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